github

Git – use a proxy

Configure Git to use a proxy ##In Brief You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'. Consider…
Internet Systems Consortium

Linux – iproute2 Cheat Sheet

Overview iproute2 is the Linux networking toolkit that replaced net-tools (ifconfig, route, arp etc.) Old style network utilities like ifconfig and route are still there just for backwards compatibility and do not provide access to…
Linux File Permissions

Linux – Permissions

  In order to update and change file permissions, you can use the chmod command. The format of the command is as follows: [crayon-68a7ca908243e846752411/] for each action   Changing Permissions VALUE MEANING rwx+ugo No…

Debian – How to disable snmpd ia_addr insert messages?

You have Debian and Ubuntu servers which runs snmpd service and are getting following message every 30 seconds within /var/log/syslog [crayon-68a7ca90826bc621408199/] This problem is related with the log level start options of snmpd service [crayon-68a7ca90826c4361938146/] With…

How to Disable or Enable Disk Write Caching in Linux

ATA-Based Disks Check out whether disk caching is enabled on your disk or not: [crayon-68a7ca908295b363944463/] To disable write caching, you need to edit hdparm.conf using your favorite editor (e.g. gedit, vi). [crayon-68a7ca9082963996103398/] …

Solid State Drives Technology Comparison – SLC, MLC, TLC NAND

SSDs (Solid State Drives) use NAND flash chips. Each of these chips contain millions of cells with limited number of write cycles. There are different types of NAND flash chips in use today with different characteristics as follows: SLC (Single…
Internet Systems Consortium

Postfix – DNSBL Providers

The complete IP check for sending Mailservers DNSBL (DNS BlackList aka RBL) lookup and FCrDNS (Forward Confirmed reverse DNS aka iprev) check tool. valli: http://multirbl.valli.org To be removed from barracudacentral blacklist please…
Internet Systems Consortium

MySQL – How to Back Up and Restore a Database

Declarations Database: [dbname] User: [uname] Password: [pass] Back up Back up a dedicated database from the Command Line: [crayon-68a7ca9082c7b828344909/] Back up all the databases: [crayon-68a7ca9082c83735712916/] Back up with…

ZFS – Replacing a dead disk in a zpool

ZFS – Single Path [crayon-68a7ca9082f1b547789649/] ZFS – Multi Path [crayon-68a7ca9082f23682120504/]
Internet Systems Consortium

BIND – Response Policy Zones (RPZ)

ISC Webinars: https://www.isc.org/mission/webinars ISC Webinar on RPZ: https://www.isc.org/wp-content/uploads/2017/12/RPZ-webinar7.ppt.pdf Security Zones - Rackspace Case Study: http://www.securityzones.net/images/downloads/Rackspace-RPZ-Case-Study.pdf Free…